Knelsen

What Knelsen does

Knelsen GmbH is a privately held German manufacturer founded in 2004 and headquartered in Salzkotten, Germany, specializing in fasteners and anchoring systems for energy-efficient window installations. The company's product portfolio is anchored by the K-Universalanker (K-Universal Anchor) line, which addresses load-bearing window fastening in modern buildings where insulation layers have doubled or tripled under energy-saving regulations. The offering spans more than twenty product families covering anchors for reveals, pre-wall mounting angles, window sill brackets with thermal separation, roller-shutter-box fixing systems (RK-Fest series), heavy-load consoles for lift-up sliding doors, adjusting elements, sealing products, insulation and static frames, connection profiles, and fall-protection holders, plus a full accessories range (screws, drills, dowels, cover caps). All products are manufactured 100% in Germany and key items are third-party tested by ift Rosenheim.

Knelsen's customers are professional window installers, glaziers, construction companies, and window/door manufacturers, with use cases spanning new-build, renovation, lift-up sliding doors, and fall-protection scenarios. The company operates a hybrid go-to-market combining its own e-commerce shop (shop.knelsen.de, built on Shopware), a multilingual corporate website (DE/EN/PL/RU/NL/FR), dedicated regional teams in Poland and Belgium, and presence at major trade fairs such as Fensterbau Frontale. It also runs an assembly training program launched in 2017 covering window installation and fall protection.

Revenue is generated exclusively through one-time hardware sales with B2B login-gated pricing on the online shop; no recurring or subscription model is in place. Strategic priorities evident in recent activity include digital channel expansion via the 2025 online shop launch, three new product introductions in 2026 (RK-Fest-SK, optimized Altbau-EL-FMW, Porenbeton-Stößel), internationalization through Polish and Belgian operations, and ecosystem partnerships such as the MHS Baunormteile co-presentation at Fensterbau Frontale 2026.

Name

Knelsen

Legal name

Knelsen GmbH

Website

https://knelsen.de

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

11–50 employees

Short description

Knelsen GmbH is a Salzkotten-based German manufacturer of specialty window fastening and anchoring systems (K-Universalanker line), selling 100% Germany-made hardware to window installers, glaziers, and construction firms via online shop and trade fairs.

Ownership category

akta.pro rank

Product category

Window Fastening Hardware

NAICS

Bolt, Nut, Screw, Rivet, and Washer Manufacturing (332722), Metal Window and Door Manufacturing (332321)

SIC

Bolts, Nuts, Screws, Rivets & Washers (3452), Screw Machine Products (3451), Adhesives & Sealants (2891)

akta.pro primary industry

Fasteners, Anchors & Connectors (Bolts, Weld Studs, Plates) (IMADACAJ)

akta.pro secondary industries

Fasteners, Nails, Screws & Anchors Retail (CRAIADAC), Weatherstripping & Door/Window Sealing Products (IMADAGAH), Doors, Windows & Millwork Hardware Retail (Locks, Hinges, Handles) (CRAIADAJ)

Keywords

• Window fastening systems
• Construction hardware
• Anchor fasteners
• Window mounting brackets
• Building anchors

Headquarters

HQ city

Salzkotten

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D

Revenue model

1. Hardware/Fastener Sales: Knelsen generates revenue through the sale of physical window fastening products including anchors, mounting angles, window sill brackets, roller shutter box fixings, accessories (screws, dowels, drills), sealing products, and custom solutions. All products are sold as one-time purchases with no recurring revenue model.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Knelsen GmbH manufactures and supplies specialized window fastening and anchoring systems, with its flagship K-Universalanker product line providing load-bearing connections for window installations in modern, highly insulated buildings. The portfolio spans anchors for reveals, mounting angles for in-front-of-facade installation, window sill brackets, roller-shutter box fixings, insulation and static frames, fall-protection components, sealing products, and installation accessories — all produced 100% in Germany and tested by ift Rosenheim. The company also offers technical consultation, custom manufacturing, and assembly training programs for window installers and glaziers.

Product overview

Knelsen GmbH is a specialized manufacturer of window fastening systems, founded in 2004 in Salzkotten, Germany. The company's product portfolio is organized around the K-Universalanker (K-Universal Anchors) product line, which provides load-bearing connections for every window assembly situation. The offering is a comprehensive ecosystem of hardware products rather than a software platform. Core products include: (1) Anchor fasteners for installation in reveals (Ankerbefestigung in der Laibung) featuring EL-Anker, FMS-Anker, SFK-Anker, WU/WM anchors, and various consoles including SL and HST-SL heavy-load brackets for lift-up sliding doors; (2) Anchor mounting in front of facade (vor der Fassade) including FMW window mounting angles with fixed and height-adjustable variants; (3) Window sill brackets (Fensterbankhalter) with thermal separation for direct mounting to frames or masonry; (4) Fixing systems for roller shutter boxes (RK-Fest series) with multiple variants for different access configurations; (5) Adjusting elements (Justierelemente) for precise positioning; (6) Sealing products (Abdichtung) including MS polymers and joint films; (7) Insulation frames (Dämmzargen) in XPS and stone wool; (8) Connection profiles (Anschlussprofile) and static frames (Statikzargen); (9) Fall protection systems (Absturzsicherung) for various installation scenarios; and (10) Comprehensive accessories including screws, drills, and mounting tools. All products are manufactured 100% in Germany. The company also provides technical consulting services and custom manufacturing, as well as installation training programs.

Differentiator

Problem solved

Functional benefit

Products and services

• K-Universalanker (K-Universal Anchors) The company's flagship window fastening product line, providing load-bearing connections for every window assembly situation. Developed specifically to address challenges posed by doubled or tripled insulation layers in modern energy-saving construction, where conventional fasteners are inadequate. Sold to professional window installers, glaziers, and construction companies.
• EL-Anker (U-Profil and Flachstahl) ift Rosenheim tested window anchors for fastening in the reveal, available in U-profile and flat steel variants. The U-profile version is marketed as 'the simple solution' for window anchoring.
• FMS-Anker (U-Profil and Flachstahl) FMS anchors for window fastening in the reveal, available in U-profile and flat steel variants and tested for overhanging window fixings.
• SFK-Anker (U-Profil and Flachstahl) Window anchors suitable for all window systems — aluminium, wood, and plastic — that can be readjusted after plastering and are tested for overhanging window fixings. Also suitable for entrance door mounting.
• FMW Fenstermontagewinkel (Window Mounting Angles) Window mounting angles for pre-wall installation (vor der Fassade), suitable for fall-proof fastening on sand-lime brick or concrete masonry. Available in U-profile, flat steel, and height-adjustable variants.
• SL-Konsole / HST-SL-Konsole (Heavy Load Brackets) Heavy-load brackets for supporting large window elements and lift-up sliding doors (Hebeschiebetüren). The HST-SL-Konsole variant includes corner protection plates and is specifically designed for lift-up sliding door installations.
• Fensterbankhalter (Window Sill Brackets) Window sill brackets for direct mounting of window sills to window frames or masonry. Includes thermally separated variants for aluminium (Thermo-AFBH) and stone (Thermo-SFBH) window sills, with walkable versions available for balcony doors.
• RK-Fest Window Fixing Systems for Roller Shutter Boxes Window fixing systems for installation in roller shutter boxes (Sturzkasten/Rollladenkasten). Available in multiple variants including fixed angle (F), folding angle (K), universal (U), compact (KOM), hanger bolt (SS), reaction cartridge (RP), direct screw (DS), and lift-up sliding door (HST) configurations, with internal and external revision options.
• Justierelemente (Adjusting Elements) Adjusting elements including BAP and WU variants plus J-Verklotzung (adjustable blocking) that facilitate easy window installation with precise positioning.
• Abdichtung (Sealing Products) Professional sealing solutions including MS FLEXI AD Polymer adhesive, interior and exterior joint sealing films, and aerosol primer for window sealing applications.
• Dämmzargen (Insulation Frames) Insulation frames in XPS and stone wool variants providing clean connection surfaces for insulation systems and preventing thermal bridges at window openings.
• Statikzargen (Static Frames) Static frames, particularly the MTF-System, designed for extending masonry and providing structural support for window installations.
• Anschlussprofile (Connection Profiles) Window sill connection profiles and floor-standing profiles, including AnPro junction profile, UnPro, and MTF-System-P. Processing is possible without cutting waste due to the plug-in system design.
• AS-Halter / Fall Protection Spacers Spacers for fall protection (Absturzsicherung), including AS-Holder SL for Gutmann fall protection systems and additional profiles. Enables fall-safe window fastening for various installation scenarios.
• Altbau EL-FMW (Old Building Window Mounting Angle) Window mounting angle developed for old buildings where the reveal remains undamaged. Can also be used in new construction with exposed concrete reveals. Direct screwing through the window into the angle provides immediate blocking.
• Porenbeton-Stößel (Aerated Concrete Plunger) Specialized drill tool (with SDS-plus shank) for aerated concrete that compacts drilling dust in the borehole to significantly increase the load-bearing capacity. Ideal for fixing to aerated concrete blocks.
• Zubehör (Accessories) Complete range of installation accessories including screws, cover caps, dowels, ETICS/insulation material fixings, bits, ratchet wrenches, cartridge presses, dosing tips, drills, and mounting aids.
• Montageschulungen (Assembly Training Programs) Training sessions for window installation and fall protection, offered at Knelsen's own facilities since 2017. Programs include theory and practical components and are aimed at window installers and construction professionals.
• Muster (Samples and Demonstration Products) Sample products including sample stones, sample frames with roller shutter boxes, and mobile masonry for training, demonstration, and product evaluation purposes.

Quantifiable outcome

• Products tested and certified by ift Rosenheim
• +1 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

Feature7 records

Partnerships

Three partnerships are on record, tiered minor and core.

• MHS BaunormteileminorChannel Partner/ Reseller/ Distributor · 1 January 2026MHS Baunormteile is a strategic partner that presented solutions in the area of roller shutter and sun protection systems at Knelsen's stand during Fensterbau Frontale 2026. The partnership provides complementary product offerings to customers visiting Knelsen's exhibition space.
• Knelsen PolskacoreChannel Partner/ Reseller/ DistributorKnelsen's Polish operation with dedicated team presence. Colleagues from Poland participated in Fensterbau Frontale 2026 to inform and consult with customers.
• Knelsen Belgium (knelsen-jmb.be)coreChannel Partner/ Reseller/ DistributorKnelsen's Belgian operation managed through their partner website knelsen-jmb.be. Belgian colleagues participated in Fensterbau Frontale 2026 to inform and consult with customers.

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Emerging players

• Gutmann: German manufacturer of aluminium windows, doors, and fall-protection systems referenced in Knelsen's product portfolio (e.g., AS-Halter SL for Gutmann fall protection). Comparable as a German specialist whose window systems create pull-through demand for Knelsen's fastening products.

Broad incumbents

• Simpson Strong-Tie: US-headquartered global leader in structural connectors and fasteners for construction. Comparable as a broad incumbent producing tested, certified fastening products for building envelope applications including window and façade connections.
• Würth: Germany-headquartered global market leader in fastening and assembly materials with a vast B2B catalog. A broad incumbent that competes with Knelsen on installer relationships and product breadth, though Würth is not specialized in window-specific anchors.
• SFS Group: Swiss-based global manufacturer of fastening solutions with a strong window, door, and façade segment. Comparable to Knelsen as a broad incumbent in window-related fastening systems, with international scale and OEM relationships.
• Hilti: Liechtenstein-based global provider of tools, anchors, and firestop systems for construction professionals. Comparable as a large incumbent in the same installer channel with overlapping anchor and fastening offerings, though Hilti's portfolio is much broader.

Direct peers

• CELO: Spanish-headquartered manufacturer of fixings, screws, and anchors with strong European distribution. Comparable to Knelsen as a specialized fastener producer serving installers and window/door manufacturers across Europe.
• Fischer: German-based global manufacturer of fixing systems, anchors, screws, and chemical fixings for construction. Closely comparable to Knelsen as both produce tested, certified anchoring solutions for professional installers across similar applications including windows.
• Rawlplug: Polish-origin global manufacturer of mechanical and chemical anchors, screws, and façade fixings. Directly comparable to Knelsen in product mix and target segment, with broader geographic reach but overlapping core competency.
• Tox: German specialist in heavy-duty anchors and fastening technology for construction. Overlaps with Knelsen in producing certified, specialized fasteners for challenging substrates and load-bearing applications in the building envelope.
• EJOT: German fastening specialist with deep exposure to window, facade, and solar mounting fixings. Directly comparable to Knelsen in target customer (window installers), product category (tested anchors), and DACH-centric distribution.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@knelsengmbh
• Facebookfacebook.com/knelsengmbh
• Instagraminstagram.com/knelsengmbh
• TikToktiktok.com/@knelsen.gmbh
• LinkedInlinkedin.com/company/knelsen-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Knelsen